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3D printing alkali-fast cement concrete and preparation method thereof

A slag cement and 3D printing technology, applied in the field of building materials, can solve the problems of difficult control of setting time and limited application, and achieve high waste utilization rate, good economic and social benefits, and significant resource protection effects

Inactive Publication Date: 2018-06-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Alkali slag cement concrete has a series of advantages such as high early strength, good fire resistance, excellent impermeability, and good resistance to seawater erosion. It has excellent performance and a wide range of applications, but it is difficult to control because of its setting time.
limit its application

Method used

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  • 3D printing alkali-fast cement concrete and preparation method thereof
  • 3D printing alkali-fast cement concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The concrete was tested according to the following formula: 40 parts of slag powder, 10 parts of steel slag powder, 15 parts of ordinary river sand, 35 parts of limestone, and the alkali activator was a mixed solution of NaOH and water glass with a modulus of 3.1 to 3.4, of which 2 parts of NaOH , 1.5 parts of water glass; 35 parts of water, 2 parts of retarder, which is a 1:1 mixture of sodium borate and sodium sulfate;

[0023] The preparation method of 3D printed alkali slag cement concrete is:

[0024] Grinding the steel slag until the specific surface area is 400-420m 2 / kg, the slag is ground to a specific surface area of ​​390-420 m 2 / kg, and then put them in an oven at 105°C for about 1.5 hours, mix them evenly to get a mixed powder, and set aside;

[0025] Accurately weigh the mixed powder and ordinary river sand and limestone aggregate according to the above ratio, put them in a mixer and stir evenly, dissolve sodium hydroxide in water glass to make an alka...

Embodiment 2

[0029] Concrete was tested according to the following formula: 45 parts of slag powder, 15 parts of steel slag powder, 15 parts of ordinary river sand, 25 parts of limestone; 6 parts of alkali activator, which is a mixed solution of NaOH and water glass, with a modulus of 2.0 and water 40 Parts, retarder 2.5 parts, for the mixture of sodium borate and sodium carbonate.

[0030] The preparation method of 3D printed alkali slag cement concrete is:

[0031] Grind the steel slag until the specific surface area is 360-410m 2 / kg, the specific surface area of ​​slag is 380-430 m 2 / kg, then put them in an oven at 105°C for about 1.2 hours, mix them evenly to get a mixed powder, and set aside;

[0032] Accurately weigh steel slag powder, slag powder, common river sand, and limestone aggregates according to the above ratio, place them in a mixer and stir evenly, dissolve sodium hydroxide in water glass to make an alkali activator, and add the alkali activator to Stir evenly in the ...

Embodiment 3

[0037] Concrete was tested according to the following formula: 50 parts of slag powder, 10 parts of steel slag powder, 20 parts of ordinary river sand, 20 parts of limestone; 5 parts of alkali activator, which is a mixed solution of NaOH and water glass (modulus 3.1-3.4) , its modulus configuration is 1.5; 42 parts of water, 2.8 parts of retarder, which is a mixture of sodium borate, sodium sulfate and sodium carbonate.

[0038] The preparation method of 3D printed alkali slag cement concrete is:

[0039] Grind the steel slag until the specific surface area is 370-420m 2 / kg, the specific surface area of ​​slag is 380-420 m 2 / kg, then put them in an oven at 105°C for about 2.0 hours, mix them evenly to get a mixed powder, and set aside;

[0040] Accurately weigh steel slag powder, slag powder, ordinary river sand, and limestone aggregates according to the above ratio, place them in a mixer and stir evenly, dissolve sodium hydroxide in water glass to make an alkali activator...

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Abstract

The invention relates to the technical field of building materials and in particular to 3D printing alkali-fast cement concrete which is made of ore slag and steel slag as raw materials. The concreteis made of the following raw materials: solid granules, an alkali excitant, a retarder and water, wherein the mass of the alkali excitant accounts for 4-10% of the mass of the solid granules; the retarder accounts for 0.5-3.5% of the mass of the solid granules; the water accounts for 10-45% of the mass of the solid granules. Ore slag powder and steel slag powder are adopted as main raw materials,an alkali excitation technique is implemented, the preparation method is simple and easy to operate, high-temperature calcining is avoided, the energy consumption is reduced, a great amount of lands occupied by industrial waste slag discharge such as steel slag are saved, and the lands are protected and saved. Dependence to natural resources is reduced, the energy is saved, CO2 emission is reduced, environment pollution is alleviated, and in addition, due to a 3D printing technique, the construction and maintenance time can be shortened, the time for casting and demolding a concrete structureis shortened, the construction efficiency is improved, and materials are saved, and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a 3D printed alkali slag cement concrete using slag and steel slag as raw materials. Background technique [0002] Alkali slag cement and concrete have excellent physical and mechanical properties and durability, and are new green building materials that are energy-saving, waste-friendly, and environmentally friendly. Alkali slag cement and concrete have been developed for more than 50 years. Through the joint efforts of several generations of scholars from various countries, the theoretical basis of alkali slag cement and concrete such as slag composition and structure, hydration physical and chemical basis, and hydration products are becoming more and more mature. The difficulties and doubts of alkali slag cement and concrete (problems of setting time control and doubts about the occurrence of alkali-aggregate reaction) were systematically studied in the 1880s and 19...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B7/153C04B7/14B33Y70/00
CPCB33Y70/00C04B7/14C04B7/1535C04B28/006C04B2111/00017C04B2201/50C04B14/068C04B14/28C04B22/062C04B22/00C04B2103/22Y02P40/10
Inventor 周宗辉王金邦程新杜鹏刘裕
Owner UNIV OF JINAN
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